EP0183669A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Joint prosthesis
Assignee: Individual
•
Filing: 1985-11-26
•
Granted: —
•
Expires: 2005-11-26
Abstract
Abstract This invention relates to a joint prosthesis for permanent anchorage in the bone tissue of a joint in a human body, for instance a knee joint. The joint prosthesis comprises an anchorage device (3, 4; 7-10, 11) disposed to be implanted into the bone tissue at a first operation so that it remains in unloaded condition during a healing phase during which the function of the joint is not prevented and an articulation device (5, 6; 13,12) which is arranged to be connected to the anchorage device only at a second operation after the said healing phase. 42
Inventors
- 👤 Per-Ingvar Branemark
- 👤 Björn Albrektsson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 21:33
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3868; A61F2/3859; A61F2002/3863; A61F2002/3895
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A joint prosthesis for permanent anchorage in bone tissue of a joint in the human body, for example a knee joint, characterized in that an anchorage device (3, 4; 7-10, 11) is arranged to be implanted in the bone tissue at a first operation so that it remains in an unloaded condition during a healing phase during which the function of the joint is not prevented and an articulation device (5, 6; 13, 12) arranged to be connected to the anchorage device only during a second operation after the said healing phase.
Claim 2
Dependent Claim
92 words
A joint prosthesis for permanent anchorage in bone tissue of a joint in the human body, for example a knee joint, characterized in that an anchorage device (3, 4; 7-10, 11) is arranged to be implanted in the bone tissue at a first operation so that it remains in an unloaded condition during a healing phase during which the function of the joint is not prevented and an articulation device (5, 6; 13, 12) arranged to be connected to the anchorage device only during a second operation after the said healing phase.
Claim 3
Dependent Claim
51 words
A joint prosthesis according to Claim 1, characterized in that each of the bone ends (1, 2) in a joint articulating against each other comprise at least one such anchorage device and articulation device, the two articulation devices articulating against each other (5, 6; 13, 12) are adapted to each other.
Claim 4
Dependent Claim
60 words
A joint prosthesis according to Claim 2, characterized in that the anchorage device comprises one or a plurality of fixture legs (7, 8, 9, 10) which form a healing surface towards the surrounding bone tissue and in that the corresponding articulation device (13) comprises connection means for connection of the articulation device to the fixture legs at the second operation.
Claim 5
Dependent Claim
37 words
A joint prosthesis according to Claim 3, characterized in that the fixture legs consist of tubular fixture screws (42, 55, 56, 62) provided with an external thread which forms a healing surface against the surrounding bone tissue.
Claim 6
Dependent Claim
24 words
A joint prosthesis according to Claim 4, characterized in that the fixture screws (42) also have an internal thread for connecting the articulation device.
Claim 7
Dependent Claim
71 words
A joint prosthesis according to Claim 4, characterized in that the femoral anchorage device comprises at least two separate fixture screws (42) accurately inserted by means of aligning instruments from the femur joint surface and the femoral articulation device comprises an articulatory surface rail part (43) and an interconnecting L-shaped element (45) connected to said fixture screws by means of two locking screws (46) screwed into the tubular fixture screws (42).
Claim 8
Dependent Claim
54 words
A joint prosthesis according to Claim 6, characterized in that the articulatory surface rail part (43) has an L-shaped socket (44) adapted to the interconnecting element (45) and provided with means (49, 50, 51) for securing the articulation device in a plane parallel to the fixture screws as well as in a perpendicular plane.
Claim 9
Dependent Claim
69 words
A joint prosthesis according to Claim 4, characterized in that the tibial anchorage device comprises at least one fixture screw (55, 56) accurately inserted by means of aligning instruments from the front in the tibia and the tibial articulation device comprises a medial and/or a lateral segment-shaped metal socket (58) at least one cylindrical guiding rod (60, 61, 63) connected to the socket via a longitudinal, vertical beam (64).
Claim 10
Dependent Claim
34 words
A joint prosthesis according to Claim 8, characterized in that the tibial articulation device comprises a cross-beam (59) and two solid, cylindrical guiding rods (60, 61) inserted into the tibial fixture screws (55, 56).
Claim 11
Dependent Claim
54 words
A joint prosthesis according to Claim 8, characterized in that the fixture screws (55, 56) are provided with a longitudinal slit (57) through which said vertical beam (64) of the articulation device is extending when the articulation device is connected to the fixture screws (55, 56) in a second operation after the healing phase.
Claim 12
Dependent Claim
51 words
A joint prosthesis according to Claim 8, characterized in that the medial tibial metal socket (65) is provided with an artificial meniscus (67) of polyethylene movably disposed on the plane upper surface of the socket and a posterior edge (68) to limit the magnitude of the movement of the meniscus backwards.
Claim 13
Dependent Claim
48 words
A joint prosthesis according to Claim 3, characterized in that two or more fixture legs (14, 15) are connected to each other to form a twin fixture, triplet fixture etc., so that the fixture legs occupy well defined positions, preferably parallel in relation to each other upon implantation.
Claim 14
Dependent Claim
27 words
A joint prosthesis according to any of the preceding claims, characterized in that at least the anchorage devices are made of pure titanium having an oxidized surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.